Effects of High Temperature on Rice Spikelet Sterility at Flowering Stage

doi:10.3969/j.issn.1000-6362.2014.05.010

Abstract

Abstract: Two indica rice cultivars Ⅱyou 7954 and Ⅱyou 7 were used as materials.They were exposed at two high temperature stress treatments，which included conventional with 38℃ between 9：00 and 14：00，and delaying with 38℃ between 11：00 and 16：00 in phytotron，their response was quantified at flowering stage through spikelet fertility.The results showed that rice spikelet sterility was highest sensitive to conventional high temperature treatment on the same day of flowering， and highest sensitive to delaying high temperature treatment on the previous day of flowering.The flowering peak delaying high temperature treatment occurred before 11：00am，which meant rice spikelet sterility was induced by high temperature before flowering，but not at flowering.Rice spikelet sterility induced by high temperature during 11：00-16：00 was mainly due to effects on anther dehiscence，pollen germination and tube growth.The results could provide references to evaluate rice resistance to heat.

Key words: Rice, High temperature stress, Spikelet sterility

ZHOU Jian xia， ZHANG Yu ping， ZHU De feng， XIANG Jing. Effects of High Temperature on Rice Spikelet Sterility at Flowering Stage[J]. Chinese Journal of Agrometeorology, 2014, 35(05): 544-548.

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